A gradient-index slab lens (2.5–3.4 mm thick) with parabolic-index profiles along the direction of thickness has been fabricated by a molecular stuffing process, and its refractive-index profiles have been evaluated.
© 1985 Optical Society of America
Y. Asahara, H. Sakai, S. Shingaki, S. Ohmi, S. Nakayama, K. Nakagawa, and T. Izumitani, "One-directional gradient-index slab lens," Appl. Opt. 24, 4312-4315 (1985)